}
	if math.Copysign(math.NaN(), -1) < math.NaN() {
		t.Errorf("math.Copysign(math.NaN(), -1) < math.NaN() returned true")
	}
	if math.Inf(1) != math.Inf(1) {
		t.Errorf("math.Inf(1) != math.Inf(1) returned true")
	}
	if math.Inf(-1) != math.Inf(-1) {
		t.Errorf("math.Inf(-1) != math.Inf(-1) returned true")
	}
	if math.Copysign(0, -1) != 0 {
		t.Errorf("math.Copysign(0, -1) != 0 returned true")
	}

   * @since 13.0
   */
  public static boolean fuzzyEquals(double a, double b, double tolerance) {
    MathPreconditions.checkNonNegative("tolerance", tolerance);
    return Math.copySign(a - b, 1.0) <= tolerance
        // copySign(x, 1.0) is a branch-free version of abs(x), but with different NaN semantics
        || (a == b) // needed to ensure that infinities equal themselves
        || (Double.isNaN(a) && Double.isNaN(b));
  }

   * @since 13.0
   */
  public static boolean fuzzyEquals(double a, double b, double tolerance) {
    MathPreconditions.checkNonNegative("tolerance", tolerance);
    return Math.copySign(a - b, 1.0) <= tolerance
        // copySign(x, 1.0) is a branch-free version of abs(x), but with different NaN semantics
        || (a == b) // needed to ensure that infinities equal themselves
        || (Double.isNaN(a) && Double.isNaN(b));
  }

		{4.459, 'f', 3, "4.459"},
		{5.459, 'f', 4, "5.4590"},

		{0, 'b', 0, "0"},
		{math.Copysign(0, -1), 'b', 0, "-0"},
		{1.0, 'b', 0, "4503599627370496p-52"},
		{-1.0, 'b', 0, "-4503599627370496p-52"},
		{4503599627370496, 'b', 0, "4503599627370496p+0"},

		{0, 'p', 0, "0"},
		{math.Copysign(0, -1), 'p', 0, "-0"},
		{1024.0, 'p', 0, "0x.8p+11"},
		{-1024.0, 'p', 0, "-0x.8p+11"},

		{float32(1.0) / float32(256), " 0.00390625 ", false},
		{float32(0), " 0 ", false},
		{math.Copysign(0, -1), " -0 ", false},
		{float64(1.0), " 1 ", false},
		{float64(-1.0), " -1 ", false},
		{float64(0.5), " 0.5 ", false},
		{float64(-0.5), " -0.5 ", false},
		{float64(0), " 0 ", false},
		{math.Copysign(0, -1), " -0 ", false},
		{"", `""`, false},
		{"foo", `"foo"`, false},
		// Newlines.

	m := make(map[float64]bool, 0)

	m[+0.0] = true
	m[math.Copysign(0.0, -1.0)] = true // should overwrite +0 entry

	if len(m) != 1 {
		t.Error("length wrong")
	}

	for k := range m {
		if math.Copysign(1.0, k) > 0 {
			t.Error("wrong sign")
		}
	}

	m = make(map[float64]bool, 0)
	m[math.Copysign(0.0, -1.0)] = true
	m[+0.0] = true // should overwrite -0.0 entry

	if len(m) != 1 {

		{name: "F32Abs", asm: "F32Abs", argLength: 1, reg: fp32_11, typ: "Float32"},           // abs(arg0)
		{name: "F32Copysign", asm: "F32Copysign", argLength: 2, reg: fp32_21, typ: "Float32"}, // copysign(arg0, arg1)

		{name: "F64Sqrt", asm: "F64Sqrt", argLength: 1, reg: fp64_11, typ: "Float64"},         // sqrt(arg0)
		{name: "F64Trunc", asm: "F64Trunc", argLength: 1, reg: fp64_11, typ: "Float64"},       // trunc(arg0)

		complex(1.0, zero)},
	{complex(1.0, inf),
		NaN()},
	{complex(1.0, nan),
		NaN()},
	{complex(inf, zero),
		complex(inf, zero)},
	{complex(-inf, 1.0),
		complex(math.Copysign(0.0, math.Cos(1.0)), math.Copysign(0.0, math.Sin(1.0)))}, // +0 cis(y)
	{complex(inf, 1.0),
		complex(inf*math.Cos(1.0), inf*math.Sin(1.0))}, // +inf  cis(y)
	{complex(-inf, inf),
		complex(zero, zero)}, // real and imaginary sign unspecified

					test(next(f, smaller), bits)
					if nfail > 50 {
						t.Fatalf("stopping test early")
					}
				}
			}
		}
	}
	test(0, 64)
	test(math.Copysign(0, -1), 64)
	test(0, 32)
	test(math.Copysign(0, -1), 32)
}

func TestMarshalRawMessageValue(t *testing.T) {
	type (
		T1 struct {
			M RawMessage `json:",omitempty"`
		}
		T2 struct {

		},
		{
			example: hex("3903e7"),
			decoded: int64(-1000),
		},
		{
			example: hex("f90000"),
			decoded: 0.0,
		},
		{
			example: hex("f98000"),
			decoded: math.Copysign(0, -1),
		},
		{
			example: hex("f93c00"),
			decoded: 1.0,
		},
		{
			example: hex("fb3ff199999999999a"),
			decoded: 1.1,
		},
		{
			example: hex("f93e00"),
			decoded: 1.5,